Composition for preserving metal surfaces against rust



I 3,u37,932 Patented June 5, 1962 3,037,932 COMPOSITIGN FGR PRESERVING METAL SURFACES AGAINST RUST George A. Barker, 4717 Yuma St. NW., Washington 16, D.C. No Drawing. Filed Feb. 6, 1958, Ser. No. 713,555 Claims. (Cl. 252-) Jtypes of seasonal use apparatus powered by internal combustion engines presents a serious problem in the matter of rust prevention. So far as I am aware, prior to the advent of this invention no satisfactory method has been devised for applying a protective coating comprising a corrosion inhibitor andprotective film to the inlet valve stems, valve seats, cylinder walls, exhaust valve seats, and

exhaust valve stems of internal combustion engines that has not necessitated stopping an engine and partially dismantling it. W

The present invention entirely eliminates such procedure; it enables the application of a tenacious, lasting film of an oleaginous, rust inhibiting composition to all such surfaces at one time and while the engine is runmng.

An object of this invention is to provide an atomizable composition for protecting metal surfaces and especially ferrous metal surfaces which are diflicult to reach.

Another object of this invention is to provide a process for coating interior surfaces in an internal combustion engine with a rust preventing film while the engine is in operationunder its own power, which film is non-flammable and indestructible by the heat or products of combustion present at its application.

A further object is to provide a method for depositing a non-flammable, adherent film coating on interior surfaces of an internal combustion engine in operation.

A still further object is to provide a novel rust inhibiting composition for application to interior surfaces of internal combustion engines.

In carrying out the process of this invention a suitable rust inhibiting composition in liquid form is packaged in a known type of pressurized spray dispensing can or Aerosol bomb in admixture with a normally gaseous propellant which may be in, or partly in, the liquid state at the can pressure but which expands rapidly into a gaseous state when released, so that the contents of the can are discharged as "an atomized spray or mist.

When a gasoline engine is to be treated for storage, it is run at a fast idle or slow race speed and the composition is sprayed from the can into the carburetor air intake while the engine is running. In a diesel engine the composition is sprayed into the inlet manifold while the engine is running. In both cases spraying is continued until sutficient protecting coating has been deposited, by which time the atomized coating composition entrained in the stream of induction air and propellant gas will have coursed entirely through the engine and will have been deposited as a continuous adherent film completely covering the inlet valve stems, valve seats, cyl-v inder Walls, exhaust valve seats, exhaust valve stems, and into the exhaust manifold.

A particularly effective propellant is carbon dioxide. Another useful propellant is any of the normally gaseous fiuorinated hydrocarbons, such as that known by the commercial name of Freon or its equivalent, namely, 1,1 difluorethane, trichlorotrifluorethane, dichlorodifiuoromethane, monochloro'difluoromethane, monofiuorotrichloromethane, l-chloro-l,l-difluorethene and 1,2-dichloro-l,1,2,2-tetrafluorethane. They are nontoxic, nonfiammable'and odorless. The liquid components are placed in a suitablecontainer, preferably-metal, or bomb provided with a "controllable atomizing exit capable'of producing asprayor foam. The propellant is then introduced under pressure until sufficient is added to atomize all liquid components upon opening the valve of the container.

When the rust inhibitor composition hereinafter described is atomized with the gaseous propellant, the prodnot is a non-flammable mist or foam which on contact with the interior surfaces of a running engine deposits an adherent, oleaginous, non-flammable film that does not break down'under the heat and products of combustion and which retains its form and consistency in-situ until removed.

An advantage of the invention is that it provides a safe and dependable composition for protecting metal surtaneous flash conditions, e. g., degummed castor oil or a mixture of such oils, a relatively volatile, normally liquid hydrocarbon solvent for such oils having a boiling point below C., a ferrous metal corrosion inhibitor and at least one oil-soluble dispersing and deterging agent, e.g., an alkali metal or an alkaline earth metal salt of a hydrocarbon sulfonic acid or sulfate having at least 10, and possibly up to 18 or more, carbon atoms.

The volatile solvent is generally used in an amount sufficient to make a readily atomizable liquid mixture. In general, the lubricating oil or mixture of oils is present in an amount from 65 to 'parts by volume and the volatile solvent in an amount from 4 to 14 parts by volume. The corrosion inhibitor is present in an amount from 0.1% to 11% by weight of the lubricating oil and the dispersing and deterging agent in an amount from 0.05 to 5.0% by weight of the lubricating oil. In general, the said agent is used in an amount which will. remain in solution and not settle out upon standing.

Suitable corrosion inhibitors include organic esters of phosphoric acids and thiophosphoric acids, and their metal salts, erg, aluminum and zinc salts. Typical esters include the monoand di-oleyl phosphates and monoand di-stearyl phosphate and zinc dithiophosphate. A large number of suitable compounds are given in US. Patent No. 2,080,299.

Among the useful oil soluble dispersing and deterging agents are the sodium, potassium, calcium, and magnesium salts of decyl, dodecyl, tetradecyl and octadecyl monosulfonic acids and monosulf-ate and the alkyl benzene sulfonates wherein the alkyl groups contain 2 to 10 carbon atoms. A preferred class of compounds are the basic calcium salts of the so-called mahogany acids. These salts are made by neutralizing mahogany acids with calcium hydroxide or carbonate. The mahogany acids and salts are described in Ind. Eng. Chem, May

1948, pages 890-897, and are made by reacting H 80 with solvent-refined petroleum hydrocarbons in the lubrieating oil viscosity range.

Various lubricating oils can be used, including degummed castor oil, but they are generally light oils of the spindle oil type, light oils and medium viscosity lubricating oils, e.g., S.A.S. 10 to 45.

A preferred composition is as follows:

This composition is charged into a conventional aerosol bomb with approximately 15% of CO by volume.

An advantage of the invention is that it provides a dependable and inexpensive corrosion resistant composition for treating internal combustion engines of all types and sizes. Another advantage is that it provides a practical method and means for protecting the internal surfaces of such engines during storage. Still other advantages will be apparent from the above.

This application is a continuation-in-part of my copending application, Serial No. 582,635, filed May 4, 1956, entitled Process and Composition for Preserving Metal Surfaces Against Rust, US. Patent 2,939,437.

I claim:

1; In a pressure container provided with atomizing means an atomizable, corrosion-inhibiting, lubricating composition consisting essentially of a petroleum lubricating oil stable at temperatures up to 210 C. in an amount from 65 to 95 parts by volume and a volatile normally liquid hydrocarbon solvent for such oil having a boiling point below 80 C. in an amount from 4 to 14 parts by volume, a ferrous metal corrosion inhibitor taken from the group consisting of organic esters of phosphoric acids and their metal salts in an amount from 0.1% to 11.0% by Weight of said oil, an oil-soluble dispersing and deterging agent taken from the group consisting of alkali metal and alkaline earth metal salts of hydrocarbon sulfonic acids and hydrocarbon sulfates of 10 to 18 carbon atoms in an amount from 0.05 to 5.0% by weight of the lubricating oil, and an inert, normally gaseous propellant taken from the group consisting of normally gaseous fluorinated hydrocarbons and carbon dioxide.

2. The product as set forth in claim 1, wherein said oil is a petroleum hydrocarbon oil of S.A.E. viscosity 10 to. 45.

3. The product as set forth in claim 1, wherein said agent is a mixture of calcium salts of mahogany acids.

4. The product as set forth in claim 1, wherein said solvent is benzine.

5. The product as defined in claim 1, wherein said propellant is carbon dioxide.

References Cited in the file of this patent UNITED STATES PATENTS 1,762,902 Werder June 10, 1930 1,995,371 Werder Mar. 26, 1935 2,080,299 Benning et al May 11, 1937 2,110,503 Duckham Mar. 8, 1938 2,182,992 Lebo Dec. 12, 1939 2,348,715 Adams et a1 May 16, 1944 2,364,284 Freuler Dec. 5, 1944 2,369,632 Cook et a1. Feb. 13, 1945 2,378,820 Amott June 19, 1945 2,524,590 Boe Oct. 3, 1950 2,580,654 Browning 2 Jan. 1, 1952 2,665,995 Bishop Jan. 12, 1954 2,790,768 McCoy Apr. 30, 1957 2,824,836 Smith et a1. Feb. 25, 1958 2,845,328 Fleishhacker July 29, 1958 2,921,027 Brennan Jan. 12, 1960 FOREIGN PATENTS Great Britain Jan. 24, 1951 OTHER REFERENCES Chemical Week, Oct. 17, 1953, pp. 44 and 45. Pressure Propelled Products, article by Lesser, Drug and Cosmetic Industry, October 1949, 396 and 398. 

1. IN A PRESSURE CONTAINER PROVIDED WITH ATOMIZING MEANS AN ATOMIZABLE, CORROSION-INHIBITING, LUBRICATING COMPOSITION CONSISTING ESSENTIALLY OF A PETROLEUM LUBRICATING OIL STABLE AT TEMPERATURES UP TO 210*C. IN AN AMOUNT FROM 65 TO 95 PARTS BY VOLUME AND A VOLATILE NORMALLY LIQUID HYDROCARBON SOLVENT FOR SUCH OIL HAVING A BOILING POINT BELOW 80*C. IN AN AMOUNT FROM 4 TO 14 PARTS BY VOLUME, A FERROUS METAL CORROSION INHIBITOR TAKEN FROM THE GROUP CONSISTIING OF ORGANIC ESTERS OF PHOSPHORIC ACIDS AND THEIR METAL SALTS IN AN AMOUNT FROM 0.1% TO 11.0% BY WEIGHT OF SAID OIL, AN OIL-SOLUBLE DISPERSING AND DETERGING AGENT TAKEN FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL SALTS OF HYDROCARBON SULFORNIC ACIDS AND HYDROCARBON SULFATES OF 10 TO 18 CARBON ATOMS IN AN AMOUNT FROM 0.05 TO 5.0% BY WEIGHT OF THE LUBRICATING OIL, AND AN INERT, NORMALLY GASEOUS PROPELLANT TAKEN FROM THE GROUP CONSISTING OF NORMALLY GASEOUS FLURINATED HYDROCARBONS AND CARBON DIOXIDE. 